Inventory planning tool
Inventory Reorder Calculator
Calculate reorder point, safety stock, and suggested reorder quantity so you can reduce stockouts without overbuying.
Built for makers, handmade sellers, and small product businesses.
Planning estimate
This calculator provides planning estimates based on the inputs you enter. Actual reorder decisions should also consider seasonality, supplier reliability, minimum order quantities, cash flow, and product shelf life.
For volatile products, review reorder settings regularly and update demand and lead time assumptions as conditions change.
Calculator
Plan when to reorder before stock gets tight
Calculation mode
Use 1 if you can reorder in single units. Use 6, 12, or another pack size if your supplier requires it.
Adds extra cover on top of the reorder point and lead time demand when suggesting a reorder quantity.
Results
Inventory planning at a glance
Reorder status
Reorder now
Reorder point
126
Safety stock
84
Lead time demand
42
Inventory position
40
Days of cover
13.3
Suggested reorder quantity
149
Reorder recommendation
You should reorder now because your inventory position is 86 units below the reorder point.
Suggested reorder quantity is 149 units based on the reorder point, one lead time of demand, and the current reorder target.
Breakdown
Inputs and buffers behind the reorder trigger
Average daily demand
3
Average lead time
14 days
Lead time demand
42
Safety stock
84
Reorder point
126
Inventory position
40
Buffer below reorder point
86
How this is calculated
How your current inventory reorder numbers are calculated
This walkthrough updates live from the form so you can see how lead time demand, safety stock, reorder point, and the suggested reorder quantity are built.
Open the live calculation walkthroughHide the live calculation walkthroughUses your current inventory planning inputs and results.
How it works
What this inventory calculator is actually helping you decide
The goal is not only to find a number. It is to understand when to reorder, how much uncertainty to buffer, and how aggressive your stock policy should be.
What reorder point means
Reorder point is the inventory trigger. It tells you when the stock position is low enough that you should place the next order before normal demand and supplier lead time eat through the remaining units.
What safety stock means
Safety stock is your demand and lead-time buffer. It exists to absorb uncertainty when actual sales run higher than expected or a supplier takes longer than planned.
Why lead time matters
Lead time demand is the inventory you expect to sell before the next order arrives. Underestimating lead time is one of the fastest ways to create stockouts even when the reorder point looks reasonable on paper.
When EOQ is useful
EOQ is most useful when you track annual demand, ordering cost, and carrying cost. It does not replace reorder point, but it can help decide whether each order should be bigger or smaller.
FAQ
Common questions
Short answers to the inventory planning questions makers and small product businesses ask most often.
What is a reorder point?
A reorder point is the inventory level where you should place the next purchase order so stock can arrive before you run out under your current demand and lead time assumptions.
What is safety stock?
Safety stock is extra buffer inventory held above expected lead time demand to reduce the risk of stockouts when demand spikes or supplier lead times slip.
How often should I update reorder points?
Review reorder points regularly whenever demand patterns, seasonality, supplier reliability, lead times, or product mix change. Volatile products usually need more frequent updates.
What service level should a small business use?
Many small product businesses start around 95% and then adjust based on stockout cost, cash flow, and supplier reliability. Higher service levels increase safety stock and reduce stockout risk, but they also tie up more cash in inventory.
What is EOQ and do I need it?
EOQ, or economic order quantity, estimates an order size that balances ordering cost against holding cost. It is useful when you track both costs, but it is optional and not required to calculate reorder point or safety stock.
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